Insulator.



PATENTED MAR. 3 1, 1903.

' R. H. POLK.

INSULATOR.

APPLICATION FILED JUNE 17, 1902.

'No MODEL.

I I INVENTOR I Attorneys 0.. wsmus'ron. 04 c.

UNITED STATES 1 PATENT OFFICE.

ROBERT H. POLK, OF BIRMINGHAM, ALABAMA.

:"aNsunAToR.

SPECIFICATION forming part of Letters Patent No. 724,329, dated March 31, 1903.

Application filed June 17, 1902.

To (tZl whom it may concern.-

Be it known that I, ROBERT HENRY POLK, a citizen of the United States, residing at Birmingham, in the county of Jelferson and State of Alabama, have invented certain new and useful Improvements in Insulators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in insulator-knobs, and particularly to such as are adapted for use in connection with twined wires for outside work and single interior wiring.

The object in view is the production of a knob provided with means for receiving and retaining the Wire, permitting the same to be secured thereto and extending at various angles therefrom.

A further object is the production of a'knob designed to receive twined wires or a single conductor extending at a right angle or a greater or less angle from the knob.

With these and other objects in view the invention consists, in combination with asuitable body portion, of radially-extending cleats spaced apart and designed to receive and hold in position twined or other wires.

It further consists, in combination with a suitable body having an annular groove, of radially-proj ectin g cleats carried by said body abovesaid groove and spaced apart for permitting the intertwining of wires.

It further consists in certain othernovel constructions, combination, and arrangements of parts, as will be hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 represents a section of interior single wiring supported by the present improved knobs. Fig. 2 represents a top plan view of a knob embodying the features of my invention. Fig. 3 represents a vertical longitudinal section taken on the plane of line 2 2 of Fig. 2.

In the art to which the present invent-ion relates difficulty has been experienced, particularlyin house-wiring, in providing against the dislocation of the wires and the crossing of the same, the difficulty principally arising from the fact that the supporting-insulators Serial No. 1121066. (N0 model.)

employed afforded insufficient purchase for the wire when directed at an angle, and in order to overcome this difficulty I have provided a knob having a plurality of lateral cleats, as illustrated in the accompanying drawings which retain the electric Wires without the necessity of the same being coiled about the body of the knob.

In the use of twined telephonewires my improved form of knob also obviates the trouble caused by crossed wires, occurring by reason of the wire cutting through the insulation when coiled or twisted around the common form of knob, for the reason that in the employment of the present knob the strain is taken equally on each wire when attached by the wires being engaged on opposite lugs or lateral cleats of the knob, as seen in the drawings.

Referring to the accompanying drawings by numerals, 1 indicates a suitable body portion bored longitudinally, as at 2, for receiving retaining means, as a suitable screw, a

plurality of depending points 6 extending from the lower end of said body for retaining the same against rotation when in use. Said body is formed with an annular groove, as 3, and the upper end of said body portion is provided with a plurality of radially-extending cleats 4 4. Each of the cleats 4 forms a segment of approximately a quarter-circle, and

said cleats are spaced apart by radial notches 5 5. Each of the segmental cleats 4 in addition to extending radially from the upper end of the body portion 1 slants in the direction of the lower end thereof and has its upper surfaces struck on the arc of a circle.

In practice the body portion 1 is secured to any suitable support by an attaching means passed through bore 2, the points 6 penetrating the material of the support for resisting twisting strains, and wires are suitably intertwined about the said body portion at the point of its groove 3 and about any one or more of the cleats 4. When twined wires are used, the same are spread apart and crossed to lie on either side of the groove 3 and about the neck of one of the cleats 4, whereby the said wires may be brought to the knob at any desired angle and led therefrom at any preferred angle without danger of becoming dislocated and without the necessity of being coiled about the body portion of the knob. It will of course be obvious that in the employment of my improved knob the particular segmental form of the cleats 4 will materially assist in preventing the dislocation of wiring and in the ready stringing of the wires when being first positioned.

Although I have described and shown four of the cleats 4, yet it will be understood that any desired number may be employed and other slight changes may be made without departing in the least from the spirit and scope of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. An insulator-knob, comprising a suitable body portion, and a segmental cleat extending therefrom, having its outer edge extending approximately for one-quarter of a circle and arranged in a plane at right angles to that of the body portion, the cleat tapering to the body portion and extending beyond the same, substantially as described.

2. An insulator-knob, comprising a suitable body, and a plurality of segmental cleats extending therefrom, each cleat covering approximately a one-quarter circle, said cleats being spaced apart and each having a comparatively narrow neck portion joining it to the body, substantially as described.

3. An insulator-knob, comprising a suitable body, having a comparatively narrow portion, a plurality of cleats extending radially from the body above said narrow portion, each cleat being spaced from the contiguous cleats by radial notches extending to the body portion, substantially as described.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

ROBERT H. POLK.

Witnesses:

W. B. HARPER, MAURICE W1LLows. 

